Fel Infusion [Metamagic

You can inundate your spells with fel energy, drawing strength from the dark powers.

Prerequisites: Any one other metamagic feat, ability to cast at least three spells with the fel descriptor.

Benefit: A spell modified by this feat gains the fel descriptor in addition to its normal descriptors. (Spells with the fel descriptor grant the caster increased saving throw DCs [by +2] and a +10 fel bonus on caster level checks to overcome spell resistance.) In addition, any damage that the spell inflicts is fel damage instead of normal damage. For example, a magic missile altered by Fel Infusion inflicts ld4+l points of fel damage. Note that the spell is still a force effect, as it retains its old descriptors.

A spell modified by Fel Infusion uses up a spell slot three levels higher than the spell's actual level.

each copy as if it were a separate spell. For example, a forked frost nova* can affect two different areas.

Each copy is at half potency. If the spell inflicts damage, the damage is halved (round down). If the spell does not deal damage and has a duration longer than instantaneous and shorter than permanent, the duration is halved (round down). If the spell does not deal damage and does not have a duration longer than instantaneous and shorter than permanent, and if it affects an area, the area is halved (round down). If none of these factors applies to the spell, the spell cannot be forked.

For example, frost nova* deals damage. A forked frostnova affects two 10-foot-radius spreads, inflicting half normal damage to creatures within each spread. Summon monster I does not deal damage (directly), but has a duration longer than instantaneous and shorter than permanent. A forked summon monster I conjures two creatures, each of which persists for half as long as normal.